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OCRmyPDF/ocrmypdf/test/test_pageinfo.py
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#!/usr/bin/env python3
from ocrmypdf import pageinfo
from reportlab.pdfgen.canvas import Canvas
from PIL import Image
from tempfile import NamedTemporaryFile
from contextlib import suppress
import os
import sys
import shutil
from nose.tools import *
TEST_OUTPUT = os.path.join(os.path.dirname(__file__), 'output')
def setup_module():
with suppress(FileNotFoundError):
shutil.rmtree(TEST_OUTPUT)
with suppress(FileExistsError):
os.mkdir(TEST_OUTPUT)
def test_single_page_text():
filename = os.path.join(TEST_OUTPUT, 'text.pdf')
pdf = Canvas(filename, pagesize=(8*72, 6*72))
text = pdf.beginText()
text.setFont('Helvetica', 12)
text.setTextOrigin(4*72, 3*72)
text.textLine("Methinkst thou art a general offence and every"
" man should beat thee.")
pdf.drawText(text)
pdf.showPage()
pdf.save()
pdfinfo = pageinfo.pdf_get_all_pageinfo(filename)
assert len(pdfinfo) == 1
page = pdfinfo[0]
assert page['has_text']
assert len(page['images']) == 0
def test_single_page_image():
filename = os.path.join(TEST_OUTPUT, 'image-mono.pdf')
pdf = Canvas(filename, pagesize=(72, 72))
with NamedTemporaryFile() as im_tmp:
im = Image.new('1', (8, 8), 0)
for n in range(8):
im.putpixel((n, n), 1)
im.save(im_tmp.name, format='PNG')
# Draw image in a 72x72 pt or 1"x1" area
pdf.drawImage(im_tmp.name, 0, 0, width=72, height=72)
pdf.showPage()
pdf.save()
pdfinfo = pageinfo.pdf_get_all_pageinfo(filename)
assert len(pdfinfo) == 1
page = pdfinfo[0]
assert not page['has_text']
assert len(page['images']) == 1
pdfimage = page['images'][0]
assert pdfimage['width'] == 8
# assert pdfimage['color'] == 'gray'
# While unexpected, this is correct
# PDF spec says /FlateDecode image must have /BitsPerComponent 8
# So mono images get upgraded to 8-bit
assert pdfimage['bpc'] == 8
# DPI in a 1"x1" is the image width
eq_(pdfimage['dpi_w'], 8)
eq_(pdfimage['dpi_h'], 8)
@raises(NotImplementedError)
def test_single_page_inline_image():
filename = os.path.join(TEST_OUTPUT, 'image-mono-inline.pdf')
pdf = Canvas(filename, pagesize=(8*72, 6*72))
with NamedTemporaryFile() as im_tmp:
im = Image.new('1', (8, 8), 0)
for n in range(8):
im.putpixel((n, n), 1)
im.save(im_tmp.name, format='PNG')
# Draw image in a 72x72 pt or 1"x1" area
pdf.drawInlineImage(im_tmp.name, 0, 0, width=72, height=72)
pdf.showPage()
pdf.save()
pageinfo.pdf_get_all_pageinfo(filename)